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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71bf055ce37f7bf99a640210b195b58d7abc1d3e4f2dd5952e5c42518ca9b04b' 
  AND token = 'bItgC02ytgK4qZWLDOZczGaip1LRtjsmDhuNyhtNmJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}